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捕鼠笼能高速地把门关闭,但触发的力量却很小.它不但应用杠杆原理,更巧妙地装置弹簧的施力点,使它的力臂配合捕鼠的目的.
The squirrel cage can close the door at a high speed, but the triggering force is very small. It not only applies the principle of leverage, but also more cleverly sets the force point of the spring, making its arm cooperate with the purpose of catching the mouse.